Microplastic ingestion in fish larvae in the western English Channel

- 2.9% of fish larvae (n = 347) ingested microplastics.
- 66% of ingested microplastics were blue fibres, mirroring trend for waterborne microplastic.
- increased incidence of microplastic ingestion with proximity to coast.
- increasing concentrations of waterborne microplastic with proximity to coast.
- ratio of waterborne microplastics to fish larvae ranged from 27:1 nearest the coast, to 1:1 at 35 km from the coast.

Microplastics have been documented in marine environments worldwide, where they pose a potential risk to biota. Environmental interactions between microplastics and lower trophic organisms are poorly understood. Coastal shelf seas are rich in productivity but also experience high levels of microplastic pollution. In these habitats, fish have an important ecological and economic role. In their early life stages, planktonic fish larvae are vulnerable to pollution, environmental stress and predation. Here we assess the occurrence of microplastic ingestion in wild fish larvae. Fish larvae and water samples were taken across three sites (10, 19 and 35 km from shore) in the western English Channel from April to June 2016. We identified 2.9% of fish larvae (n = 347) had ingested microplastics, of which 66% were blue fibres; ingested microfibers closely resembled those identified within water samples. With distance from the coast, larval fish density increased significantly (P < 0.05), while waterborne microplastic concentrations (P < 0.01) and incidence of ingestion decreased. This study provides baseline ecological data illustrating the correlation between waterborne microplastics and the incidence of ingestion in fish larvae.

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